The Stability of PGM and AK Isoenzymes in Human Tissues

Many blood group systems are known and are in regular use in blood transfusion laboratories. Such laboratories deal with fresh samples of blood in good condition. The forensic laboratory, on the other hand, mostly must work with dried blood in the form of stains on many different substrates and in all types of condition, and the only blood grouping tests suitable for forensic use are those in which the group factors are stable to drying. In this context it is useful to know how stable the various blood group factors are and to determine whether these factors change with age, for this could lead to confusion in typing the material.